Frame for motor-cycles.



A. H. BILSTEN.

FRAME FOR MOTOR CYCLES.

APPLICATION FILED SEPT. 1s, 1912.

y1,056,492, Patented Mar. 18, 191B.

ARTHUR H. BILSTEN, 0F WORTIIINGTON, MINNESOTA.

FRAME FOR MOTOR-CYCLES.

Specification of Letters Patent.

Patented Mar. 18, 1913.

Application led September 13, 1912. Serial No. 720,302.

To all whom t may concern Be it known that I, ARTHUR H. BILSTEN, acitizen of the United States, residing at VOrt-hington, in the county ofNobles, State of Minnesota, have invented certain new and usefulImprovements in Frames for Motor-Cycles; and I-do hereby declare thefollowing to be a full, clear, and eXact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

The present invention is directed to improvements in frames ofmotor-cycles or the like, and has for its object to provide the rearfork thereof with a spring connection for lessening joltings or jarsduring the travel of the machine.

With these and other objects in view, this invention resides inthe novelfeatures of construction, formation, combinations and arrangements ofparts to be hereinafter more fully described, claimed and illustrated inthe accompanying drawing, in which Figure 1 is a side elevation of therear portion of a motorcycle frame, showing the same equipped with thespring connection. Fig. 2 is a longitudinal sectional view through oneof the arms of the rear fork. Fig. 3 is a sectional view on line 3 3 ofFig. 2. Fig. 4 is a similar view on line 4-4 of Fig. 2.

Referring to the drawing the numeral 1 designates the rear portion of amotorcycle frame, the same consisting of the usual seat mast 2, to theupper end of which is secured the upper end of the rear fork 3, the arms4 of which are formed from tubular metal. Secured to the lower end ofthe seat mast 2 are the forked arms 5 to the outer ends of which arepivotally connected the sections G, the purpose of which will appearlater. The arms 4 are threaded interiorly at their lower ends forengagement by the sleeves 7. Passing through the sleeve 7 and within thearms 4 are rods S, the upper ends of which are provided with disks 9which are engaged upon their under surfaces by the upper ends of thecoil springs 10, the lower ends of which rest upon the upper ends of thesleeves 7 said springs encircling that portion of the rod whichreciprocates in the arms 4. Surrounding the lower ends of the rods 8 arecoil springs 11, the lower ends of which rest upon a ianged disk 12secured to the rods 8 and near the lower ends thereof, the upper ends ofsaid springs bearing against the bottom of the sleeve 7.

The eXtreme lower ends of the rods 8 project slightly below the disks 12and are pivotally connected to the outer ends of the sections 6 so thatwhen the machine is traveling over rough or uneven ground the jar andjolting incident thereto will be lessened or relieved by the springs 10and 11, the springs 11 serving to cushion the shock upon upward movementof the rods 8 and the springs 10 the downward movement thereof.

1. In combination, a cycle frame having forked tubular rear arms havingtheir upper ends connected to the seat mast of the frame, forked armssecured to the lower end of the mast, sections pivotally connected tothe outer ends of the last named arms, rodsslidably engaging the tubulararms and having their lower ends pivotally connected to the outer endsof said sections, and means for yieldably holding the rods connected tothe tubular arms.

2. In combination, a motorcycle frame comprising a seat mast, forkedvtubular arms connected at their upper ends to the vseat mast, sleevessecured in the lower ends of said arms, forked arms having their innerends secured to the lower end of the seat mast, sections pivotallyconnected to the outer ends of the last named arms, rods slid ablymounted in the tubular arms, said rodshaving their lower ends pivotallyconnected to the outer ends of lsaid sections, disks secured to theupper ends of the rods, coil springs surrrounding the upper ends of therods and having their upper ends engaging said disks and their lowerends the sleeves, similar springs surrounding the lower ends of saidrods and having their upper ends bearing against the lower ends of saidsleeves and their lower ends resting upon disks secured near the lowerends of said rods.

In testimony whereof, I afix my signature, in presence of two witnesses.

ARTHUR H. BILSTEN. Witnesses: l

ALBIN H. BiLsTEN, VEUM VVYsTRoM.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D.-C.

